what is proper d.s length for 70 340 4-speed?

340plot said

so if the d.s is like 50 1/2- 51 1/2 will still work?,, and are all the universal joints the same size?

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The 51 1/2" one should but I don't think I would use the 50 1/2".....would probably vibrate. U-joints should all be the 2 1/8" ones those years.